Watch List notes:

Victoria (1837-1901), Proof or Pattern Threehalfpence, 1870, young head left, rev. en médaille, crowned mark of value, edge plain, 0.72g (ESC 3475 [R5] {2262}; S.3915), attractive cabinet tone overlying otherwise brilliant surfaces, but for faint cabinet friction to hair fillets, as struck, extremely rare.
provenance
Spink Numismatic Circular, March 1997, no. 1079 (illus.) - almost FDC" - £475
Estimate: £600 - £800"